20100549 Ver 1_Stormwater Info_20100726

STORMWATER MANAGEMENT REPORT
Davis Village Subdivision
i
Cary, North Carolina
Prepared y:
WITHERS RAVENEL, IC
111 acKenan Drive
Cary, North Carolina 27511
March
April Revised
June 2010 Revised
W&R Project No. 02100002
STORMWATER MANAGEMENT REPORT
DAVIS VILLAGE SUBDIVISION
CARY, NORTH CAROLINA
INTRODUCTION
The purpose of this Stormwater Management Report is to document pre- and post-development
peak water flow rates for the 1-year, 2-year, 5-year, 10-year, and 100-year design storm events as
well as document nitrogen loading rates from the site. The goal is to ensure that the additional
impervious surface being added to the site does not increase the peak outflow from the site during
the 1-year storm.
The current zoning is RMF-CU and TR-CU. The runoff from the first inch of precipitation will be
captured and treated in a wet detention pond. In addition to capturing the first inch of runoff, the
wet detention pond will be designed to attenuate the 1-year peak storm event, as well as the 2-year,
5-year, and 10-year storm events from the post development to -0 development conditions.
METHODOLOGY
The storm water study was conducted using the natural drainage features as depicted by existing
field surveys. Proposed drainage areas were based on field survey data and proposed development
within the drainage areas.
The scope of work included the following analyses:
Hydrology
? Simulation of the 1-year, 2-year, 5-year, 10-year, and 100-year rainfall events for the
Wake County area
? Formulation of the 1-year, 2-year, 5-year, 10-year, and 100-year flood hydrographs for
the pre- and post-development drainage areas
............. _ _ _
Davis Village Subdivision
W&R Project 00210002
Stormwater Management Report June 2010
HYDROLOGY
The SCS Method was used to develop runoff hydrographs for the Type II, 24-hour duration, 1-year
storm event in the Cary area, and the 24-hour duration rainfall curves determined using the NOAA
Atlas 14 rainfall data for Raleigh-Durham International Airport for the 2-year, 5-year, 10-year, and
100-year storm events. This method requires three basic parameters: a curve number (CN), time of
concentration (tc), and drainage area.
Curve numbers were based on soil type and land use. Soil types were delineated from the Soil
Survey of Wake County, North Carolina (November 1970). Land use for existing conditions was
based on the most recent Wake County aerial photographs and field observations. Post
development land use is based on the proposed site plan. The curve numbers used in this study
are listed in the appendix of this report.
DOWNSTREAM ANALYSIS
.....................................................
Davis Villa
ge Subdivision W&R Project 00210002
Stormwater Management Report June 2010
required. In addition to the overall site reduction of the 1-year, BP 1 will be designed to
attenuate the 2-year, 5-year, and 10-year storm events as compared to -40 predeveloment'
conditions.;
CONCLUSIONS
1-year Peak Attenuation
Based on the routing study, the predevelopent 1-year storm peak flow is 9.68 cfs. The
corresponding post development 1-year peak flow is 9.51 cfs. Therefore, the proposed design
satisfies the project wide requirement of detaining the 1-year storm event.
2-year, 5-year, and 10-year Storm End of Pipe
Based on the routing study, the following flows were calculated for BMP 1.
'form _ Pre
Event
F Development
F!? .,G (efs)
2-vea r 13.1
vYar 21.0

€
'27
100-vea r 4 5 .
Post I_ Attenuated
Development Flows
Flows (cf.-) (cfs)

41.9 ?'
48.5
®
_ 19, E
673. 35.4
Based on the data, the design for the wet detention pond meets the requirements of the Stormwater
Management requirements of the Land Development Ordinance.
Davis ViCage Subdivision
Stormwater Management Report
W&R Project 00210002
June 2010
RESULTS SUMMARY
BMP Z
Pro
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_. . _... . ........................................................ . ....... - _

DESIGN SUMMARY
Uaws Village Subdivision W&R Project 00210002
Stormwater Management Report June 2010
Davis Village Subdivision W&R Project oo2iocro2
Stormwater Management Report June 2010

Joky File-. K \10\10-0000\10000 -Pulte-Day.i;s Drive\H-H\BMPNWE'r BOND 0610.0.PPW
Item Dir: K:\1 \10-0000\10007 -Pulte-Davi3 Drive\H-H\BMP;
JOB TITLE
Project Date: 6/11/2010
Project Engineer: Ken Jesneck
Project Title: Davis Village
Project Comments:
2nd Submittal Revision
SIN Bentley .Systems, Inc.
Bentley PondP ck (10.00.0 7.00) 2..51 PM 6/11/2010

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1
Executi_. _y (R,_ ..... 2.01
Exec (I` ...... 2.02
Network -ales vaquence 2.03
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Executive Summary (Nodes) .......... 2.05
Executive Summary (Links) .......... 2.06
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Executive Summary (Nodes) ........ ,. 2.09
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Summary (Links) .......... 2.12
RDU NONA 100yr.. 100
Time-Depth Curve ................... 4Al
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Outlet 1.,...... Outlet Input Data 5.01
Composite Rating Curve ............. 5.04
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GNP 1 ........... Pond E-V-Q Table ................... 6.01
BMP 1 OUT 1
Pond Routing Summary ............... 6.04
BMP 1 OUT 2
Pond Routing Summary ............... 6.05
BMP 1 OUT S
Pond Routing Summary ............... 6.06
.BMP 1 OUT 10
Pond Routing Summary ............... 6.07
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Pond Routing Summary ............... 6.08
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SINa Bentley Systems, Inc.
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Type.... Executive Summary (Nodes) Page 2.05
Name.... Watershed Event: 2 yr
File.... K:\3,0\10 -0000\100002 -Pulte -Davis Dri,ve\H-H\BMP\Wet Pond 061010.ppw
Storm... RUN NOAA 2yr Tag: 2
NETWORK SUMMARY -- NODES
{Tran,= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & At)
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Storm Tag Name = 2
Data Type, File, TO Time -Depth Curve BUD NO AA Syr
Storm Frequency = 2 yr
Total Rainfall Depth= 3.4400 in
Duration multiplier = I
Resulting Duration = 23.9904 hrx
Resulting Start Time= 0000 tars Step= .0833 tars End= 23a9904 tars
SIN- Bentley Systems, ITic.
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Name.... Watershed Event: 5 yr
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Storm Tag Name 7= 5
Data Type, File, ID Time -Depth Curve RDU NO 5yr
Storm Frequency 5 yr
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Duration Multiplier = 1,
Resulting Duration = 23.9904 hrs
Resulting Start Time- .0000 hrs Step= .0833 hrs End= 23,9904 hrs
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Type.... Executive Summary (Nodes) Page 2:11
Name.... Watershed Event: 100 yr
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Data Type, File, ID = Time -Depth Curve ADD NO AA 100yr
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Duration Multiplier = I
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SIN: Bentley Systems, Ino.
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--- 1

13.74
14. q,t -0
14.' 4. _303
14.E r 4.2 ?3
15. 2
15.L_ ..
16.i 4, .7
16.1 4.4239
17.( 4.4711
4.51 3
17.9uy1 E
n)
rs
first value in each row.
C --------------
.0169 ----------
" 5
.0338 .0450 .(-i-
.0619 f 0721 L
. 0900 . 1 - ... 1 _
.1181 2 75
.1463 1:- a -
.i?44 .1 16 .19 3
;25 .2194
.2475
.2F38 --)44 .2- 6
.21369 .2925 .2' 3
.3150 .3206
.3431 .34 .3 4 - 0
.3713 .37( .3825 .3881
.3994 .4144 .4239
?8 -)22 .4 .4' 1
)00 4 5) 3
37 5
.5 14 .5 U
.D317 _ ? .0
.6789
-51 '7 _6 .7 .S Ca 7 "-9
7 .8126 .8"1.7! -7
.8 - .8975 .9144
. 33 .9822 .9' 2 1.071-1
1. )0 1.0754 1 . - 1.1263
1.1771 1.2025 1. 27 1.2533
1.3042 1.32 1.3_ J 1.t' 7
1."150 1.9750 -,"- l
3.18 ?0 3.7 3.4517
3. 4 3. 3.7 3.72 7
3.7775 - 29 3.: 3.8 -3
3. 16 3 3. 3.99
3.9978 47 4.0 7 4-
4.0825 4.llb4 4.1 3
4.1672 4.2011 4.1-EL
4.2444 4.2633 4.x'23
4.2917 4.3(111 4.3106 4.-
4.3389 4.3483 4.3578 4.-
4. 361 4.39,' 4.4051 4.?'. 1
4.4 11 4."" 4,4522 4As17
4.- -6 4.4 4.4994 4.5089
4.5 78 4.53`. 4.5467 4.5561
4.,)750 4.58utD 4.5862 4.5919
=y PondPack (10.00.027.00)
l _ Sy ;t ic.
2:50 PM 6 "_112010
Type.... Time -Depth Curve Page 4.04
Name.... RDD NOAA 10yr Tag: 10 Event: 10 yr
K:\10\10 -0000\100002 -Pulte -Davis Drive\H-H\BMP\Wet Pond 06.1010,.opw
Storm- RDU NOAA 10yr Tag: 10
SYNTHETIC CUMULATIVE RAINFALL{in}
Time I
Output
Time increment = .0833
hrs
hr5
--------------------------------------------------------------
Time on left
represents
time for first value
in each row,
18.3260
4;5975
4,6031
4.6087
4.6144
4.6200
18.7425
4.6256
4.6312
4.6369
4.6425
4.6481
19.1590
4.6537
4.6594
4,6650
4,6706
4.6762
19.5755 1
4,6819
4.6875
4.6931
4.6987
4.7044
19.9920 1
4.7100
4.7156
4.7213
4.7269
4.7325
20.4085 1
4.7381
4.7438
4.7494
4.75561
4¢7606
M8250 I
4.7663
4.7719
4a7775
4.7831
4.7888
21.2415 1
4.7944
4.8000
4.8056
4.8113
4.8169
21,6580
4.8225
4.8281
4.8338
4.8394
4.8450
22.0745
4.8506
4¢8563
4.8619
4.8675
4.8731
22.4910 1
4.8788
4.8844
4.8900
4.8956
4.9013
22.9075 1
4.9069
4.9125
4.9181
4.9238
4.9294
23.3240 1
4,9350
4.9406
4.9463
4.9519
4.9575
23.7405 (
4.9631
4.9688
4.9744
4.9800
SIN, Bentley Systems, Inc.
Bentley PondPack (10.00.027.00) 2.50 PM 6/11/2010

Type..:. .... Page 4.05
Name..., Tag: 2 Event: 2 yr
File ..., )2-Pulte--Davis Drive\H-Hik3MP\Wet Pond 061010.ppw
Storm..,. 2 2

,LL (in)
T, R = .0 833 hrs

- Time on i?z
-------------- represen
---- .s - le for first value it E W.

.0
.0000 -------
.0039 -----------
00078 ------------
.0 7 -- - ------
--
16 .0194 .0233 .027" 0
.0389 .0428 .04 i_o 4
l.i1 5 ,0583 0622 .0 0'1C .0739
I.UvVO .0778 '7 _ 31 .0933
2.0825 I .0972 ".1 .1 .1128
2.4990 . - 7 .1206 .12 l_ .1322
2.9155 .14? .1118 .1517
3.3320 ! .1 6 .1 .1633 .1672 .1711
3,7485 ( .'7?0 1,39 .1828 .1867 .1906
4.1`0 J I 4 .iy83 .2022 .2"°" .2100
4. 5 I 39 .2178 .2217 .7 .2294
J .2372 .2411 .2 '9
.2567 .2606 ./"44 .2 3
5.-3:0 I 12 .2761 .2800 42x.3 .2 5
6.2475 .3050 .3113 .3 75 3
6.664n I )0 .3363 .3425 .3 ?i )
7.0805 _ _3 .3675 .3738 _: 2
7.? '_ .3925 .3987 .4050 .4 ' .f 175
7. .4237 .4300 .4362 .44z?) .1 "17
4550 .4612 .4675 .4737 ? )
8.7? ,48E2 .4925 .4987 .5 ) '-7
9.16 ° .5400 .5517 . j
9."7 .5983 .6100 _7
_ .6567 .6683 .6 E _7
J. _5 3 .7150 .7308 .7 5
10.E .'17 3 .7942 .8100 .8"- C :17
ll.: E 5 .8733 .8892 .9 50
11.i 1.' -'J 1.0700 1.191".
12.(7 t 2.2500 2.3700
12.= 2.1 )8 2.. 2.5? 5 2.
?.° 2.' 2.o4 2.6or7 2_e >
2.c 2, 2.72.) 2.7367 2.)
2.7 3 2.-, 7 2.7833 2.7950
14. 2,E 3 2.300 2,841'1 2.8533 2.80: )
14.`7, 2.87`7 2.8883 2.9000 2.9117 .__33
1 _t 2. 2.9413 2.9475 2.9_ _ 2_ )
15. 2._ 2.9725 2.9788 2.- 2.
15 t 3.0038 3.0100 3.0
1 - •, 3. 3.0350 340413 3.0, i5
16.. 3. 1 3.na,i3 3.0725 3.0`;88 3. >)
17.C' 3.0 _3 3. 75 3.1038 3.1100
17.493 3.1225 - 8 3.1350 3.1413 3.1_t5
17. u1 3.1538 1._ 0 3.1639 3.1678 3.17.G7
SIN ansp Inc.
Bentiey -k (10.00.u27.00) 2:50 PM 6/11/2010
Type.... Time-Depth Curve Page 4.06
Name.... RDU NOAA 2yr 2 Event: 2 yr
File.... N:\10\10-0000'.!'} -sulr_e-Davis Drive\H-H\BMP\Wet Pond 061010.ppw
Storm... RDU NOAA Syr 2
I
h -
------- --------------
18. .1756
3.1950
l _ 3.?144
_9, 3.: 9
< 3.
3.
< „ 7
22.
23.3
23.740)
7
3., 0
3.< 3
3.171
3.1989
3.2183
3.2378
3.2572
3.2767
3. L 31
3..
3.3
3.- l
3. ?8
3.4322
3.2028
3.2222
3.2417
3.2611
3.9806
3. 00
4
3. a9
3.3 83
3.3778
3.3972
3.4167
3.4361
3. 7-
3.2067
3.2?r,l
3.2 E
3.
. _3
3.3 R
3.3233
3.3428
3.3622
3.3817
3.4011
3.4206
3.4400
- 2
.? L
3. J
.2 9
-3
3. '2
" -7
3L
3.____
3.4% I
Bentley - Inc.
Bentley PondPack (10.00.027.00) /11/2010
Ty lrve Page 4.07
.. RL-- 5yr Tag: 5 Event: 5 yr
K:\1( ) 000\10000 2-Pulte- Davis Drive\ H-H\B"n'-. ' --end 061010.ppw
RL . a a yr Tag: 5
T(' 1. _- - _n)
I ment = rs
h
--- Time an lE
-- time is rst value in cw.

0. 0 I ------------
.-0 0 --- - -_ _..a_
0c
. 01.46
4
L - I 3 2 .0389
-3 _ ,0632 i
1.2495 .0729 78 OE .0875 .1 4
^: I 09"72 .1021 .1069 .1118 .11 7
I 7.?15 .1264 1313 .13ti1. ?lO
2. 8 .1507 .1556 .1 _ .1653
2. .1750 1i .1896
3 .1993 .2C 2 u .2139
3.?_ 5 I .2_ .2236 2wr 2
4.ib5O I .2479 .25 .2576 L -5
4.5815 ( .26i .2722 .2-i-, - .2819
4.9980 1 'S 7 .291 .3014 .3063
5.4145 ) .3160 .3257 .3306 v
5.8310 ) .3403 .3500 .3579
6.<' 5 _7 .38" .3975
6.66 r _ .4371 0
7.C I .4767 .4E_6
7.-- 0 I .45 .5CE 3 .5 -6 .52 2
7.-' 5 ( 5321 .5479 .: 1,8
8.3300 ( .5717 .57 .5875 -L.
5 ( . 6113 . 611 _ .6271 . 6 6 4
.1630 ) .1-39 .6783 .6928 .7072 .7217
9. f 5 ) i f,1 .7506 .7650 .7794 .7939
3 228 .8372 .8517 Esl_
10. ) -1 .9163 .9375
1.0225 1.0438 1..
11.; 5 ) .{ 1.0=_ I5 l___88 1.1? 0 l.<
? ._ 1..3700 1.6- 1. S i67
2. 2.7767 ) 3. 3 3.0;_7
12. 0 ) 3.1713 3 25 .21 7 3.2350
12.9115 ) 3.1 3 3.2775 3 ^.. 3.- 3
13.3280 3.3838 iG 3.47` 3,4 39
13.7445 3.1 3 3. 38 3. 7 2 3.4 1- _.L
14.:'-'Q I 3.52u6 3. - 3.5494 3.5639 x.11-3
14.57 5 I 3.5928 3.6217 3.6361 3.6
1 . 3.6650 3. 29 3.6808 3.6888 3.6967
1-5., 3.7046 3.7125 3.7204 3.7283 3.7363
0 ) 3.7442 3.7521 3.'7600 3.7679 3.7758
1.6.7 5 ) 3.7833 3.71.7 3.7996 3.8075 3.8154
16.bouO ( 3,8392 3.8471 3,8550
1.7.0'765 3.8788 3.8867 3.8946
17.4930 3.9 25 3. 14 3.9183 3.9263 3.9342
;17.9095 A 3.9421 3.?iu00 3.9549 3.9597 3.9646
Bentley ` ck (10.00.027.00)
2:50 PM
Bentley
y
6/11/2010
Type.- Time -Depth Curve Page 4.08
Name.... RDU NOA A 5yr Tag: 5 Event: 5 yr
File.... K:\10\10 -0000\1,00002 -Pulte -Davis Drive\H-H\BMP\Wet Pond 061010,ppw
Storm... RDU NOAA Syr Tag: 5
SYNTHETIC CUMULATIVE RAINFALL(in)
Time I Output Time increment - .0833 lirs
hrs I 'rime on left represents time for first value in each row.
--------- I ------------------------------------------------
18.3260 1
3.9694
3.9143
3.9792
3.9840
18.7425 1
3.9938
349986
4.0035
4.0083
19.1590 1
4.0181
4.0229
4.0278
4.0326
19,5755 1
4,0424
4;0472
4.0521
4.0569
19,9920 1
4,0667
4.0715
4.0764
4,0813
200085 I
4,0910
4.0958
4.1007
4.1056
M8250 1
4.1153
4.1201
4.1250
4.1299
21,2415 I
4.1396
4.1444
4.1493
4.1542
21-6580 1
4.1639
4.1688
4.1736
4.1785
22.0745 1
4.1882
4$1931
4.1979
4.2028
22.4910
4.2125
4;2174
4.2222
4.2271
22.9075 I
4.2368
4.2417
4.2465
4.2514
23.3240 1
4.2611
4.2660
4.2708
4.2757
23.7405 j
4.2854
4.2903
4w2951
4.3000
SIN.
Bentley pondPack (10.00.027.00) 2:50 PM
-----------
3.9889
4.0132
4.0375
4 . 0618
4,0861
4.1104
4.1347
4,1590
4.1833
4.207
4.2319
4.2563
4.2806
Bentley Systems, Inc.
611112010

Type.... _ Page 4.09
Name.... Tag; 1
File.... e',l v, -u ,- JO002-Pulte- Davis Drive\H-H\BM P\wet Pond 061010.ppw
_ .1( hrs

_ ---'j-- Time on
----------- =zz rej _s time for rirst w,

.-C
.000 ---------
.0 ------------------
,002 --
3
304
.5000 .005 .006 .007 OU8 .009
1."0__ .011 .012 .013 .014 .015
1.5000 .016 .017 .018 ._20 .021
2.0.. J .022 .023 .024 6 .027
2.50 0 .028 .029 .031 .033
3.0"00 .035 .036 .037 .040
3.5 l .041 .042 .044 .04U .047
4. C} .048 .049 .051 .052 .054
4. 0" .055 .057 .058 .060 .061
5.vO0" .063 .065 .066 .068 .070
5.500 .071 .073 .075 .076 .078
6.0000 .080 .082 .084 .085 .087
6.'00- .089 .091 .093 .095 .097
7.0000 .099 .101 .103 .105 .107
7.510 .109 .111 .113 .116 .118
8.0000 .120 .122 .125 .127 .130
8......J .132 .135 .138 .141 .144
9.0CJ0 .147 .150 .153 .157 .160
9.. 00 .163 .166 .170 .173 .177
10.0000 .181 .185 .1.89 .194 .199
10.51 10 .204 .209 .215 .221 .228
11.1__00 .235 .243 .251 .261 .271
11.5Cv .283 .307 .354 .431 .568
12.10C) .663 .682 .699 .713 .725
12.,,6. .735 .743 .'751 .759 .766
13.0000 .772 .778 .784 .789 .794
13.5000 .799 .804 .808 .812 .816
14.0000 .820 .824 .827 .831 .834
14.5000 .838 .841 .844 .847 .850
15.rllcC .854 .856 .859 .862 .865
15.50"0 .868 .870 .873 .875 .878
16.0-C,. .880 .882 .885 .887 .889
16._ C .891 .893 .895 .898 .900
17.0000 .902 .904 .906 .908 .910
17.` 00 .912 .914 .915 .917 .919
18.000! .921 .923 .925 .926 .928
18.500u , .930 .931 .933 .935 .936
19.0000 I: .938 .939 .941 .942 .944
19.5000 .945 .947 .948 .949 .951
20.0000 j .952 .953 .955 .956 .957
20.5000 [ .958 .960 .961 .962 .964
21.0000 # .965 .966 .967 .968 .970
21.5000 .971 .972 .973 .975 .976
F
° ums Inc.
bentiey ronaeack (10.00.027.00) 2®50 PM 6/11/2010
m ?
pe.... _ stiv Page 4.12
T 2 Ta( 1 Event: 1 yr
iie.... K:\luti iu-G \10000 2-Pui_te- Davis Drive\H-H\ BMP\Wet Pond 061010,ppw
__orm... TypeIl 24 Tag: 3
CUMUL ATT RA TNFATJL T)F { ' 7)
C)r t ,rerr I hrs
11 Time on 1 t v G
------- -- I-----
0 ----------
,0000 - -
0
2
0 ( 54 02" .0250 -2
1, ) 5 041" ( 49
1 . 4 .0 0( 4
2. J .0696 7`
.0881 _ r C 6
3.( .1074 .1114 3
3.50 1 .1274 - .1357 .1398
4. .1482 11 _ 3 .1569 .1F13
- _ .1.58 .1703 .17Z- .1795 2
5. 0 .1890 .1938 .1987 .2037 7
J .2138 .2189 ,2241 .2293 L-
6- .20 .24F' .25 .2565 .2C -
_ .2- .2851
7. 1 .3153
1. 3 .3341 .34 i .3469 . -F- 4
J _ .3668 .3798 .3"=_ .3888
v.. .4050 .4136 .4?24 .4316
9.--- .4 10 -?6 .4602 4
9.`?v v .5092 .5 2
10. J O C 5684 ? 3
10. 3( I- ) 32 56 0
11. .7280
.9205 1. 1 4
-2. 1.' 2._ 59 2-C959 2,1
?. 2." 3 2.2141 2.2763 2-
2.' 2. 9 2.3509 2.3671
1 2.. ' 0 2. )8 2. 240 2.436_ 2.1_ 5
-_. 2.1iuu0 2.4710 ,. - 2,4 2.5027
14. 2.5129 2.5228 2 2.54-- 2.5514
2.5605 2.5694 2 _ 2.5 `" 2.5948
15. _ 2.6029 2.6107 -4 .` a 2.6330
0 2.6400 2.6469 2 7 2.(- 2.6670
2.6736 2.6801 2. 65 2. 2,6991
7, t 2.7053 2.7114 2.7174 2.72.: 2.7"'13
-?- 2.7351 2.7408 2.7465 2.7 2.7-,5
2.7630 2.7684 2.7737 2.7, 2.; )
2.7891 2.7941 2.7990 2.C 2.."
1 2.8133 2.8179 2.8224 , . ?6 2.
2.E -6 2.8398 2, 40 2.8 2.£ L
2u. 2.` 2.8599 8 2.8roi6 2.8/15
20..'3 2 . ? 3 2.8791 _ 2.8867 2.8905
21.( _ 0 ".( 3 2.8980 2. 17 2.9054 2.9091
21 5uu O 2.9165 2. jz01 2. 9238 2.. 9274
1 l: Bentley Sy: -- - lc.
Bentley i (10.00.027,00) 2:50 PM 6i'-* --/2010
1
--te-Davis Drive\H-H\BMP\-
1

J tC ,
'y t-Lu.uu.uzr.uu) 2:50 PM /1112010
_ pe .... Out.le
Outlet
__le-, K;\10\lv m v .2-2ulte-T)-riq Drive\u-
)ND WS
320.-j ft
= 10 ft
m 326.00 ft
i *)c**ic ?r it *lc it k##' ;- {! { kJr**#i? #
---> Fo rd Flow Only
,01
ID-"q oF1 01 (l vas.,
--->
DD ---> OF 3t 32
GL ---> TW 31i 32 -
P
(10,00.027,00) 2:50 PM
Bentley
In.
12010
T - Data
at i
File.... K:\10\1 10002-Pul Dr-,
- - - - IN. _ _
lar
? UU f f
a =
- 32 t
= 12.` q.ft
_ - a
Na
= t
0
GLy P~ (10.00.027,00)
G : 3 u EIM
5.02
1010. Dew
Be c.
6/11/201.0
Type.- Outlet Input Data .03
NE -utlet 1
File. K:\10\10-0000\1C____ ___te-Davis Drive\EI-__,_. _end _
ITA
316 - 317.( Et
117.00 ft
117.00 ft
-.00427 ft/ft
.0130
.2000 (f( n t 1z y
.012411 (p+ )
.2000 (reve sss;
mce = .001 +J- ft
DATA...
-Drm = 1
col K - .0018
-01 M = 2.0000
C = .02920
_ y = .7400
1.064
J) = 1.209
-.500
1 qu. below T1 elev.
_ 1 qu. above T2 elev.
3uka Ld subz let control,
w rl &
A_ __ ---> F1 = 15.55 s
Al 1-2 r ,v = 3i o t- ---> Flvw = 17.77 cis
e ID = TW
Type....
Name....
File.... K,

32_DoO .00
32 ,60 .01
320.70 .02
320.80 .03
320.90 .03
321.00 .04
321.10 .04
321.20 .04
321.30 .05
321.40 ,05
321.50 .05
321.60 .06
321.70 .06
321.80 .06
321.90 .20
322.00 .58
322.10 1.20
322.20 2.02
322.30 3.03
322.40 4.19
322.50 5.51
32.2. 60 6.91
322.70 8.41
322.80 9.96
322.90 10.8`1
323.00 11.70
323.10 12.48
323.20 13.22
323.30 13.91
323.40 14.56
323.50 15.19
323.60 15.80
323.70 16,40
323.80 16.95
323.90 17.50
324.00 18.02
324.10 18.54
324.20 20.14
_ Pul__ _v Drive\I1-._,-
nf,,,,i A r i n 1 0 -,
k***
_dotes
-------------------------
,1 ) Q. C R
DD, -- (no --: VO,R',
DD,CL (no Q: 00,RO)
DD,CL (no Q: 00,RO)
DD,CL (no Q: 00,RO)
DD,CL (no Q: 00,RO)
DD,CL (no Q: 00,RO)
DD,CL (no Q: 00,RO)
DD,CC, (no Q: 00,RO)
DD,C:I, (no Q: 00,RO)
DD,CL (no Q: 00,RO)
DD,CL (no Q: 00,RO)
DD,CL (no Q: 00,RO)
DD,CL (no Q: 00,RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00, DD, CI, (no Q: RO)
00, DD, Cl, (no Q: NO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00, DD, CL (no Q. RO )
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q. RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,DD,CL (no Q: RO)
00,RO,DD,CL
SIN: Bentley Systems, Inc.
Bentley PondPack (10.00.027,00) 2:50 PM 6111/201.0
Type.... Compoeite Rating Curve
Name..utlet I
Page 5.05
File .... K:\10\10 -0000\100002 -Pulte -Davis Drive\H-H\BMP\Wet Pond 061010.ppw
S/N: Bentley Systems, Inc.
Bentley PondPack (10.00.027.00) 2:50 PM, 6/11/2010
COMPOSITE OUTFLOW SUMMARY ****
NO Flev,
Total
Notes
----------------
--------
Converge
-------------------------
Elevr
Q
TW El
Error
ft,
--------
of
-------
ft +/-:Et
--------
Contributing
Structures
324.30
22.65
Free
Curtail
--------------------------
O0,RO,DD,CL
324 40
25.-/6
Free
Outfall
00,RO,DD,CL
324,50
28,78
Free
Outfall
OD, R0,DD, CL
324.60
30.55
Free
OuL fall
00,RO,DD, CL
324f70
32.34
Free
Outfall
00,RO,DD, CL
324.80
34.11
Free
Outfall
00,RO,DD, CL
324.90
35.72
Free
Outfall,
fila, R0,DD,CL
325.00
37.12
Free
Outfall,
O0,R0,DD,CL
325.10
38.14
Free
Outfall
O0,R0,DD,CL
325.20
38.58
Free
outfall
RO,CL (no Q:
00,DD)
325.30
38.89
Free
Outfall
R0,CL (no Q:
00,DD)
325.40
39.20
Free
Outfall
O0,R0,DD,CL
325-50
39.51
Free
Outfall
RO,CL (no Q:
00,DD)
325.60
39.80
Free
outfall
RO,CL (no Q:
00,DD)
325.70
40.10
Free
Outfall
RO,CL (no Q:
0, DD)'
325.80
lei a40
Free
Outfall
RO,CL (no Q:
Citi, Dei)
325.90
40a69
Free
Outfall
R5, CI (no Q.
tit?, DD)
326.00
40:99
Free
Outfall
RG,CL (no Q:
00,DD)
S/N: Bentley Systems, Inc.
Bentley PondPack (10.00.027.00) 2:50 PM, 6/11/2010

Type.... Pond P_V-Q Table Dago 6.01
Marne.... B mP -I
File..., K.-\1.0\10-0000\100002-PLil,te-1 avi Drive\H-EI\BMP\Wet Pond { 61010.pp
LEVEL POOL ROUTING DATA
HYG Dir = X:\10\10 -0000\100002 -Pulte -Davis Drive\H-H\ MP\
Inflow HYG fila = work_ pad. by - BMP 1 S%!
Outflow HYG file = work-pad.hyg - BMP .i OUT 2
Pond Mode Data = AMP 1
Pond Volume Data = BMP 1.
Pond nutlet Data = Outlet 1
No Infiltration
INITIAL CONDITIONS
Starting
WS Eley
3M50
ft'
Starting
Volume
.000
ac -ft
'Starting
Outflow -
.00
cfs
Starting
lnfiltr-
.00
cfs
Starting
Total l Qout=
.00
Cf,
Time Increment -
,0500
firs
Elevation
Outflow
Storage
Area
infilt.
Q "dotal
2S/t + 0
ft
-------------------------------------------------------------------------------
n1t
ac -ft
sq. ft
t$
cfs
cfs
32 1 q 50
.00
.000
9731
;00
.00
00
32M0
.01
-023
10119'
:DO
.01
1.1.04
320.7
.02
.04 -;
10511
.00
.02
22151
320.80
,03
.071
10917
,00
.03
34.42
320.90
;03`
.097
11328'
.00
.03
46.78
321.00
.04
.123
1174 -
.00
.04
55.61
321.10
,04
.150
11871
.00
.0
72.73
321.201
.04
.178
11597
00
.04
86.00
321.36
.05
.205
12124
.00
.05
99.40'
3111.40
.05
.233
12251
.00
.115
112.94
321.53
.05
.262
12379=
.00
.05
126.63
321..60
.016
a290
12508
.00
.06
1411,46
321-.70
.06
.315
12537
.00
o6
154.43
321.80
.06
. 3,18
12757
.00
.06
168,55
323-90 9 {1;
:20
.378
12£33 3
.00
.20''
182.94
322.50
58
,407
13229
-00
a58
197.73
322.10
1.20
.437
1.306
.00
1.201-
21.2.34
322.20
2.02
4157
13103
.00
2.02
228.20
322tr30
3=03
.497
13139
.00
3.03
213.75
322>.40
4-.19
.528
13176
.00
4.19
253.57
SITS: Bentley Systems, Inc.
Bentley PondPaok {10.00.027.02} 2.50 PM /11/2010

'T'ype.... Pond E-V-Q Table
Name.... BMP 1
File.... K:\10\10-0000\100002-Puite-Davis Drive\TI-H\BMP\Wet Pond u01010.ppw
)OL
'G f i.1-' --
C. _c r HYG = c -
,de BMP 1
P a plume i a= BMP 1
P C.tlet Data = Outlet 1
N _nfiltration
INITIAI,
'ult Dri
1 _
1 2

UU eta
00 Cfs
_ .0500 hrs
Eleva _tn C a Storage Area
ft -.ft
32 .5. .51
2.,,J -.91
322.70 8.41 .619
322.80 9.96 .649
322.90 10.87 .680
323.00 11.70 .711
323.10 12.48 .741
323.20 13.22 .772
323.30 13.91 .803
323.40 14.56 B34 _
323.50 15.19 .865
323.60 15.80 .""7
323.70 16.40 3
323.80 16.95 v9
323.90 17.50
324.00 18.02 1.022
324.10 18.54 1.053
3< .2^ 20.14 1.085
0 22.65 1.117 _
?4.40 25.76 1.148
SIN:
Bentley PondPack (10.00.027.00)
Q Total 2S1 O
C_
5.51 1
.0 .. 91
.U0 x.41
.00 9.96
.00 10.87 33_
.00 11.70 355.01
.00 12.48 371.35
.00 13.22 387.
.00 13.91 4"'.
.00 14.56 4
.00 15.19 4
.00 15.80
.00 16.40 {
.00 16.95
.00 17.50
.00 18.02
.00 18.54 5;-
.00 20.14 545..J1
.00 22.65 563.14
.00 25.76 581.60
2:50 PM
t stems, Inc.
6111/2010
Type.... Pond P,'-V-Q Table Page 6.03
Name.... BMP 1
File.... K:\10\10-0000\100002-Pulte-Davis Drive\H-H\BMP\Wet Pond 061010.ppw
HYG £il =
--TG --
BMP 1
= PIMP 1
Vata = Outlet 1
N - ?_ ion
L
- ft
_ s
'ult Dri
1 _
T 2
Ele Infilt. - 2SI O
i 0.00
324. 1. Z 35 -1.19
/-4.70 J-..54 1.2/1,1 i_ 313 U0 JZ.34 ?
324.80 34.11 1.276 13 ?"0 .00 34.11
324.90 35.72 1. 3 ) 35.72 6 ".77
325.00 37.12 1. 1 37.12 685.70
325.10 38.14 ; 38.14 702,32
325.20 38.. 1. 38.58 718.47
325.30 11. s 1.437 UU 38.89 7-4.--
325.40 3_.. 1.470 .00 39.20 7, .
325.50 39.-1 1.503 14 -4 .00 39.51 767.0
325.60 39. 0 1,536 1 _10 .00 39.80 763.41
325.70 40.1 1.570 14 "7 .00 40,10 799.88
325.80 L . ' 1.603 1. .00 40.40 816.44
325.90 40. 1.637 1 ill .00 40.69 833.10
326.00 40. 1.671 7_ ,00 40.99 849.85
SIP
Bentley PondPack (10.00.027.00)
2:50 PM
anti F stems, Inc.
6111/2010
Type.... Pond Routing Summary Page 6.04
Name.... 13MP I OUT Tag; I Event: I yr
Fite.... K,.\10\10 -0000\100002 -Pulte -Davis Drive\H-H\BMP\Wct Pond 061010ppw
Storm... Typell 24hr Tag-. I
LEVEL POOL ROUTING SUMMARY
HYG Dir = K:\10\10-0000\100002-Pialte-Dav-is Drive\li-HNBMP\
Inflow HYG file = work -Pad.hyq BMP i IN I
Outflow HYG file - work-pad.hyg AMP 1 OUT I
Pond Node Data = AMP I
Pond Volume Data AMP I
Pond Outlet Data Outlet I
No Infiltration
INITIAL CONDITIONS
Starting
WS Elev
320.50
ft
Starting
Volume
.000
ac -ft
Starting
Outflow
�00
cfs
Starting
Infiltr,
.00
cfs
Starting
Total Qout=
.00
cfs
'rime Increment
.0500
hrs
TNFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak
Inflow
n 24.08
eta at 11.9500 hrs
Peak
Outflow
7.95
cfs at 12.1000 hrs
-----------------------------------------------------
Peak
Elevation
322.67
ft,
Peak
Storage
.609
ac -ft
MASS BALANCE (ac -ft)
--------------------------
+ Initial Vol. .000
+ HYG Vol I'M 1.343
- Infiltration ;000
- HYG Vol OUT 1,281
- Retained Vol 063
----------
Unroofed Vol -.000 ac -ft (1008% at' Inflow Volume)
SIN- Bentley Systems, Inc.
Bentley PondPack (10.00.027.00) 2:50 PM 6/11/2010

Type—, Pend ficuting Summary Page 6.05
Name ... BMP 1. OUT Tag 2 Event: 2 yr
File.... K -\10\10 -0000\100002 -Pulte -Davis Drivo\ i-H\BMP\Wet Pond 061010.pp
Storm. a a RDU NOAA 2yr Tag: 2
LEVEL POOL ROUTING SUMMARY
HYt, Chir = K:\10\10 -0000\100002 -Pulte -Davis Drive\H-H\BMPN
Inflow HYG file - work padxhyq - RED I IN 2
Outflow HYG file work-ad.h - BMP I OUT
Pond Node Data = BMP 1
Pond Volume Data u 13MP I
Ponce Outlet Data Outlet 1`
No infiltration
INITIAL CONDITIONS
Starting
WS Elev -
320 50
It
Starting
Volume
.000
ac -ft
Starting
Outflow
.00
cfs
Starting
Infiltr:
.00
cf
Starting
Total Qout-
.00
cfs
Time Increment -
.0500
hrs
INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak
inflow
= 33.40
cfs at. 1. .1000 his
Peak
-----------------------------------------------------
Outflow -
11.92
cfs at 12.3000 hrs
Peak
Elevation
323.03
ft
Peak
Storage
4 719
ac -ft
MASS BALANCE {ac -.ft}
--------------------------
Initial Vol - .00
+ HYC3 Vol IN 1.645
- Infiltration .SCJ
- HYG VolOUT 1,550
- Retained Vol = .065,
Unroutdd Vol -,0017 ac -ft (.005'k of Inflow volume)
SIN Bentley Systems, Inc.
Bentley PondP ck (10.00.027.00) 350 PM 6/11/2010

Type.... mond Routing Saimnary Page 6.0
Name._.. AMP I OUT Tag: 5 Event; 5 yr
File.... Et\10\10-0000\100002--E?tal.t - Davis D,riv \H--[I\BMP\W t Pond 0610 0.pp
Storm..:. RDD NOAA syr Tag,
LEVEL, POOL: ROUTING UMMARY
HYG Dir :K;\1,0\10 -0000\100002 -Pulte -Davis Drive\tl-H\B id'\
Inflow HYG fila - work pad.hyq BMP lid
Outflow HYG fila work-pad.hyg- AMP I OUT
Pond Node Data = HMP l
Pond Volume Data = BMP l
Donn Outlet Data = outlet l
No Infiltration
INITIAL CONDITION
:starting
WS Elev -
32MO
It>
Starting
Volume
.000
ac --ft
Starting
Outflow -
.00
et
Starting
Infiltr.
:00
cf
Starting
Total Qout=
.00
Cfs
Time Increment -
.0500
hrs
INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak
Inflow
= 41..92
c s at 1.2.1000 hrs
Peak
Outflow: _
- Infiltration_
eta at 12.3000 hrs
Peak
Elevation
}16.
323.67
ft
Peak
Storage
.920
ac -ft
MASS BALANCE
--------------------------
(ac -ft)
A. Initial Vol.
�l}�
+ HYG Vol. IN
- 2.251
- Infiltration_
Itik
- HYG Vol OUT,
2 1,83
- Retained Vol
.068
Unrout rl Vol
= -.000 ac -ft
a003% of Inflow volumej
Irl. Bentley Systems, Inc.
Bentley PondP c (10.00. 27.00 :50 Phi 61111 010

Type.... Pond Routing Summary Page 6.07
K.:\10\10 -0000\100002 -Pulte -Davis Driv 1H-H\BMP\Wet Pond 061010.ppw
Storm... ADD KOAA l0yr Tag: to
LEVEL POOL ROUTING SUMMARY
HYG €biz` = K:\10\10 -0000\100002 -Pulte -Davis Drive\H-H\BMP\
Inflow HYG filo � work-pad.hy - RMP I IN 10
Outflow HYG file work_pad.hyg - BMP 1 OUT 10
Pond Norte Data = BMP l
Fond Volume Data = BMP 1
Pond nutlet Data = Outlet 1
No Infiltration
INITIAL CONDITIONS
Starting
WE l lev
320.5
ft
Starting
Volume
.000
ac -ft
Starting
Outflow
.00
of
Starting
Inliltr.
.00
ufs
Starting
Total Q7ou'tn
.00
cfs
Time Increment -
.0500 500
ter
Peak
Inflow
- 48.51:
cfs at 12.1000 hr.s<
Peak
-----------------------------------------------------
Outflow -
19.07
cfs at 12,3000 hr
Peak
Elevation
324.13
ft
Peak
Storage -
1.064
ac -ft
MASS BALANCE (ac -ft)
+ Initial Vol.
+ HYG Val IN
- In.fil,tration:. =.
HYG Vol OUT
Retained Vol,
Unrout d Vol
.00
2.741:
2.672
.07t
...,.000 sic:. -ft,
(.001% of inflow Volume)
SIN: Bentley Systems, Inc,
Bentley PondPack (10.00.027.00) 2:50 PM 6/11 /2010

Type.... Pond Souring Summary Page 6.08
Name.... BMP 1 OUT Tag: 100 Event: 100 yr
File - - K:\10\10 -0000\100002 -Pulte -Davis Dr. ive\H-H\BMP\Wet Pond 061010.ppw
Storm... RDD NO AA 100yr Tag, 100
LEVEL POOL ROUTING SUMMARY
HYG Dir = K:\10\10-ODOO\100002-Pulte-Davis DrivV\H-J,l\BMP\
Inflow HYG file = work-Pad.hyg - BMP 1 IN 100
Outflow HYG file = work-pad.hyg - BMP I OUT 100
and Node Data v BMP I
Pond Volume Data = EMP I
Pond Outlet Data = Outlet I
No Infiltration
INITIAL CONDITIONS
Starting
WS Eley =
320.50
ft
Starting
Voluxte
.000
ac -ft
Starting
Outflow
.00
cfs
Starting
Infiltr.
.00
cfs
Starting
Total Qout=
s00
cfs
Time Increment
.0500
hrs
INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak
Inflow
63.64
cfs at 1.2.1000 hrs
Peak
-----------------------------------------------------
Outflow
35.42
cfs at'. 12.2500 hr5
Peak
Elevation --
324.88
ft
Peak
Storage =
1.302
ac -ft
MASS BALANCE (ac -ft)
--------------------------
+ initial Vol = .000
4 HYG Vol IN 4.510
- Infiltration = .000
HYG Vol OUT = 4.436
Retained Vol x073
----------
Unrouted Vol -.000 ac -ft, (.001% of Inflow Volume)
SIN, Bentley Systems, Inc,
Bentley PondPack (10. 0.027.0 ) 2:50 PM 6/11/2010

A-1
- - R

Nitrogen Control Plan
Commercial / Industrial / Residential Sites with Known Impervious Area
Project Title: Davis Village
Basis for Exemption -- --
Show buffers on site plan
Part H. Nitrogen Calculations (Method 2, Appendix C):
13.36 acres
12.72 acres
4.95 acres
77
................

acres
0.64 acres
b. Pre-development loading:
Type of Land Cover
Permanently protected undisturbed open
space (forest, unmown meadow)
Permanently protected managed open space
(grass, landscaping, etc.)
Impervious Area
Nitrogen Loading Rate (Ibs/ac/yr) = 1 17
c. Post-development loading
Type of Land Cover
Permanently protected undisturbed open
space (forest, unrnown meadow)
Permanently protected managed open space
(grass, landscaping, etc.)
Impervious Area
Nitrogen Loading Rate (lbs/ac/yr) _
TN Export
Area T export coeff from use
!acres! i3kssla?:;YFr) 11z?ejyv}

1 2. /15

_ ......
45 L'-'1 .'
TOTAL
'I
8.50
Proposed BMP(s) Wet Pond & Filter Strip Estimated Buy Down = $10,334
Nitrogen Load after BMPs =
..................
Nitrogen Load offset by Payments = 0.91 Ibs/ac/yr
Net change in on-site N Load = 4.90 Ibs/ac/yr
Part III. Control of Peak Stormwater Flow (for 1 year, design storm)
Calculated Pre-development Peak Flow 9.68 cfs
Calculated Post-development Peak Flow 27.6 cfs
...............
Proposed BMP(s) 1 Wet Detention Pond's
Post BMP Peak Flow 7 o rrs
1, the undersigned, certify to the best of my knowledge that the above information is correct :g
Supply notes & details showing control of Nitrogen and peak stormwater runoff.
Nitrogen Loading Calculations
Project Name: Davis Village Date: 6/11/2010
Project : 2100002 _ Computed by:
TOTAL TRACT
Total Area: 1,916?
=
_.......... _ .......................... .
Impervious; Z?i :,i
.............. .....
_...- --- -
Natural Open Space Area:
%r;?,s; qt's
Managed Open Space Area:
Lot Area:
Estimated Pre-Development TN Loading
............
Type of Lind Cover .......
Acres ..
TN Export Goeff. TAE 1=X.FORT (Itisty r-j %
7'ermanently Protected Undisturbed Ai-ea 0 0.36
Permanently Protected Managed Area G OL 1.2 0.00
rnpervious Surface 12. 7? 21.2 269.66
I la 13.36 20,2 l7(}{)5
Estimated Post-Development TN Loading
Dramage area A:.1.o Wel Pond n1
..........
.
Type of Land Cover Acres I N Export CoeH. (Ibs/ac/yr) TN EXPORT (Ibs/yr)
Permanently Protected Undisturbed Area }.?5t? u ti 000
Permanently Protected Managed Area A :1)2 1.2 5.18
Err pprvious Area 4_ 1 J. ;') 21.2 104.94
i s
otai 9.2 r I 'l 0,12
........
Estimated BMP Reduction for Wet Pond:
Estimated Drainage Area A Nitrogen Loading Reduction: 27.5."S ibslyr
T Export 82 5 91 Ibsl;Yr
Estimated BMP Reduction for Filter Strip: ?:, ! ?(-. Estimated Nitrogen Loading Reduction 24.78 Ibsh/r
Type of Land Cover
.............. ...............................
__1esmanentiy Protected Undisturbed Area
'ermanently Protected Managed Area
mpervious Area
L area B: To D , A #N/A
Acres TN Export Coeif
(lbs/ac/yr)
..........
........................
0.6
1.2
21.2
f otal? 1"). ;0
Estimated BMP Reduction for Dry Pond:
Estimated Drainage Area Nitrogen Loading Reduction for Wet Pond:
10%
0.00 lbstyr
Drainage Area C,: To Wet Pon,- ~ N/A
Type of Land Cover Acres i N Export Goefi. TN EXPORT (Ibs/yr)
(Ibs/ac/vr)
........ .. . .......
Permanently Protected Undisturbed Area v.b 0.00
Permanently Protected Managed Area 1.2 0.00
Impervious Area 21.2 0.00
... .... .......
I otalW;. n.00 U.V1 J
.. ... ...... __ _ ?.
Estimated BMP Reduction for Wet Pond: 25 %
Estimated Drainage Area C Nitrogen Loading Reduction: 0.00 Ibs/yr
_............... _
Drainage, Area D Untreated Arn„
........_ ................ .. ..........
1 N Fx xort r?r-?I "
Type of Land Cover Acres tlbs/ac/-' TN E °OR I (Ibs,`;:}
................ -
i-lermanently Protected Undisturbed Area 2 0.6 1.4"l
Permanently Protected Managed Area I 6 '+ 1.2 1.97
npervious Area (trail) 21.2 0.00
_. ...........
Totals 4.09 3.44
Estimated BMP Reduction for Sheet Flow through Buffer: 30 %
Estimated Drainage Area D Nitrogen Loading Reduction: 1.03 Ibs/yr
Estimated BMP Reduction: 0 %
Estimated Drainage Area E Nitrogen Loading Reduction: 0.00 Ibs/yr
Estimated Project Pre- P TN Export: 113.56 Ibs/yr
Estimated Project P T Removal: 53.34 Ibs/yr
Estimated Project TN Load Rate After Ps: 4.51 lbs/ac/yr
Estimated Project Composite Nitrogen Loading Rate Reduction: 46.97 %
Estimated Buy Down $10,334
.,

........ ........ .......... _ .........
Project Name: Davis Village Townhomes
City/State: Cary, NC
Project #: 2100002
Date: 11-Jun-10
Table 1.1 Surface Area to Drainage Area Ratio for Permanent Pool Sizing for 85% Pollutant
Removal Efficiency in the Piedmont
`5® impervious Pernianeat Pool De pth (fleet)

A 4.6 5.0 0.0 7.0 8.0 4,0
IV ................... .1 J?
, j 1
I
V. J
? 0.43 I 0 35 0 3 i 029 I { 26
20 0,91-1 _ `E 70 ......._
0.59 0,51 ? (l fJ ? 0.44
30 97 83 0
64 - 0 2 -
.....L.... . ___ ;-_ .... 1 ,
40 1. / a J 1.^1 5
.J
1 { Y
i_,. (O
0. 8 2 }
?. 7

0 2.40 -1 2.0
I i3
0

70
2.83 _i ...
'.4(s
J,' 1
1 i
E.35
1 it
80 3.36
!0
i .?7?
!
..._ ...
1 42
. ..........
90 3.74 3. 1111 01 2.,,5 6 2 ?-.,4 9, 11
bource: NUDLN /D4VU Siormwater Best Management Practices, pg. 5, April 1999
Total Area = 9.27 Ac
Streets = 69349 SF 1.59 Ac
Sidewalk = 14948 SF 0.34 Ac
House = 94285 SF 2.16 Ac
Driveway = 24930 SF 0.57 Ac
Patio = 12284 SF 0.28 Ac
Total Impervious Area = 4.95 c
% Impervious Surface Area = 53.44%
Surface Area of Permanent Pool:
Assumed depth = 3 feet
SA/DA ration = 2.18 % From Table 1.1
Minimum pond surface area (SA) = (DA * SA/DA ratio)/100
SA = 0.202 acres
8803 sq. ft.
1-Inch Runoff Volume Calculation
Using the runoff volume calculations in the "Simple Method" as described by Schueler (1987)
Rv = 0.05 + 0.009(1) where, Rv = Runoff coefficient, in./in.
I = Percent impervious
Rv = 0.531 in./in.
Total runoff volume from 1-inch precipitation:
Runoff volume, S = (Design rainfall) (Rv) (Drainage Area)
S = 0.410 acre-ft
17867 cu. ft.
Project Name: Davis Village Townhoes
City/State: Cary, NC
STO ATE P - et Detention Pond
Orifice Calculator
= *( )^(1/)
Variables
Q Volume
Head
Draw down time
Orifice Area =
Orifice Diameter =
USE
17859.6 cf
1.085 ft
259200 s
1.978291 sq. in
1.5 In DIAMETER ORIFICE
Actual Diameter = 0.012272 sq ft
Crest Elevation = 321.50 msl
Orifice Elevation = 318.20 msl
Head = 3.36 ft
Flow = 0.11 cfs
Proie1 ct #: 2080134
Date: 11-Jun-10
Constants
9 = 32.2 ft/s2
Cd= 0.6